iosr-JMCE   Volume-19 ~ Issue-6 ~ Nov. – Dec. 2022

Abstract: The seismic response of spatially extended structures, such as bridges, pipelines and dams, is influenced by the differences in the ground excitations over distance. This research analyzes the effect of ground motions on the 2D response of concrete gravity dams. The modeling of concrete gravity dams involves material nonlinearities (the concrete in the body of the dam), and geometric nonlinearities (contact between the dam and the reservoir). The model is then utilized to reproduce the 2D cross section of the Koyna Dam in India, which was severely damaged during the 1967 Koyna Earthquake. The research will include the analysis of the Koyna dam example in the ABAQUS manual then the results obtained will compare with other cases for the dam when geometry of it changes also when the boundary condition also changes .

Keywords: ABAQUS, Cracks, nonlinear, concrete dam, seismic Analysis.

[1]. R. de Borst,. Fracture in quasi-brittle materials: a review of continuum damage based approaches, Engineering Fracture Mechanics, 69, 2002, 95-112.
[2]. J. Oliver, A.E. Huespe, M.D.G. Pulido, and E. Chaves. From continuum mechanics to fracture mechanics: the strong discontinuity approach, Engineering Fracture Mechanics, 69, 2002. 113-136.
[3]. Z.P. Bazant. Concrete fracture models: testing and practice, Engineering Fracture Mechanics, 69, 2002, 165-205.
[4]. S.S. Bhattacharjee and P. Leger. Concrete constitutive models for nonlinear seismic analysis of gravity dams – state-of-the-art, Canadian Journal of Civil Engineering, 19, 1992, 492-509.
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Abstract: Using rib on the absorber plate, an experimental study has been conducted to improve the efficiency of a solar air heater. The analysis of the thermal performance of a Solar Air Heater (SAH) with V rib with gaps, V rib without gaps and plain observer plate has been carried out in this researchfor varying mass flow rates on the SAH. To verify the performance enhancement, experimental outputs including outlet air temperature, and thermal efficiency were assessed. The maximum thermal efficiency of the V rib with gap absorber plate SAH were determined to be 78% at a mass flow rate of 0.045 kg/s, respectively 13.11% and 37.27% higher than the V continuous rib and without rib SAH.This study demonstrated that for the parameter under investigation, V-shaped ribs with gaps in a flow configuration offer superior thermal performance over continues ribs and smooth plate SAH.

Key Word:Solar air heater, V shaped roughness, energy

[1]. Bakry, A. I., El-Samadony, Y. A. F., El-Agouz, S. A., Alshrombably, A. M., Abdelfatah, K. S., & Said, M. A. (2018). Performance of the one-ended evacuated tubes as medium temperature solar air heaters at low flow rates. Sustainable Energy Technologies and Assessments, 30, 174-182.
[2]. Velmurugan, P., &Kalaivanan, R. (2015). Energy and exergy analysis of solar air heaters with varied geometries. Arabian Journal for Science and Engineering, 40(4), 1173-1186.
[3]. Luan, N. T., &Phu, N. M. (2020). Thermohydraulic correlations and exergy analysis of a solar air heater duct with inclined baffles. Case Studies in Thermal Engineering, 21, 100672
[4]. Bensaci, C. E., Moummi, A., de la Flor, F. J. S., Jara, E. A. R., Rincon-Casado, A., & Ruiz-Pardo, A. (2020). Numerical and experimental study of the heat transfer and hydraulic performance of solar air heaters with different baffle positions. Renewable Energy, 155, 1231-1244.
[5]. Nidhul, K., Yadav, A. K., Anish, S., & Arunachala, U. C. (2020). Efficient design of an artificially roughened solar air heater with semi-cylindrical side walls: CFD and exergy analysis. Solar Energy, 207, 289-304.

Abstract: Background: Cement manufacturing uses non-renewable sources of raw materials. In addition, the cement loading process produces air pollution from carbon dioxide gas. This phenomenon has made environmentalists protest strongly against cement production. Many researchers used waste as a substitute for cement. One that has been tested to replace cement is rice husk ash waste. Because no studies have used RHA as a substitute for PCC types, this study evaluated its effect when used in mortar exposed to acid rain. Materials and Methods: Tests for the properties of the PCC-RHA paste were carried out for normal consistency and setting time. Furthermore.......

Key word: Rice huskash ;Mortar;PCC;Acidrain;Initialtime;Compressive strength

[1] L. Krishnaraj and P. T. Ravichandran, ―Investigation on grinding impact of fly ash particles and its characterization analysis in cement mortar composites,‖ Ain Shams Eng. J., vol. 10, no. 2, pp. 267–274, 2019, doi: 10.1016/j.asej.2019.02.001.
[2] P. Zhang, L. Kang, Y. Zheng, T. Zhang, and B. Zhang, ―Influence of SiO2/Na2O molar ratio on mechanical properties and durability of metakaolin-fly ash blend alkali-activated sustainable mortar incorporating manufactured sand,‖ J. Mater. Res. Technol., vol. 18, pp. 3553–3563, May 2022, doi: 10.1016/j.jmrt.2022.04.041.
[3] M. B. Kretzer, C. Effting, S. Schwaab, and A. Schackow, ―Hybrid geopolymer-cement coating mortar optimized based on metakaolin, fly ash, and granulated blast furnace slag,‖ Clean. Eng. Technol., vol. 4, Oct. 2021, doi: 10.1016/j.clet.2021.100153.
[4] Z. Yang, P. Shi, Y. Zhang, and Z. Li, ―Effect of superabsorbent polymer introduction on properties of alkali-activated slag mortar,‖ Constr. Build. Mater., vol. 340, Jul. 2022, doi: 10.1016/j.conbuildmat.2022.127541.
[5] Y. L. Ng, M. A. A. Aldahdooh, M. Y. D. Alazaiza, M. J. Bashir, V. S. Chok, and C. A. Ng, ―Influence of alum sludge ash and ground granulated blast furnace slag on properties of cement mortar,‖ Clean. Eng. Technol., vol. 6, Feb. 2022, doi: 10.1016/j.clet.2021.100376.

Abstract: The study carried out relates to the analysis of the water quality of different wells drilled in the commune of Shituru. It is important to ensure the quality of water intended for human consumption. Surface water and groundwater must be treated in order to eliminate problems linked to pathogenic microorganisms, dissolved minerals, suspended sediments. Simple analyzes must be carried out such as temperature, conductivity, PH, hardness or hydrometric title (TH), salinity, the alkalimetric title (TA) or complete alkalimetric title (TAC). After construction of the various boreholes, it is essential to ensure the waterproofing of the tablecloth to avoid any problem of water pollution. The groundwater, due to the crossing of porous layers of soil or rocks, are often potable bacteriologically. On the other hand, during the filtration process, water is responsible for dissolved minerals, which can make it harmful (presence of excess of nitrates or fluorides) or simply unpleasant (excess of ironand manganese).

Key word: water treatment, water catchment, well, organoleptic properties.

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Abstract: Water in human life has a very important function and must be fulfilled in everyday life. During the dry season, some parts of Indonesia experience drought and a clean water crisis which results in scarcity and difficulty in drinking water. One solution that can be done to overcome this problem is to obtain water from the air using a device that is called air-water harvester. The amount of water mass produced depends on several variables such as RH, intake air temperature, air velocity, type of condensing unit and engine power. This study aimed to determining the performance of the air-water harvester machine at various intake air velocities. This research was conducted experimentally with R134a refrigerant as the working fluid.......

Key word: Air-water harvester; Coil evaporator; Mass of water production, Air velocity

[1]. Mirmanto M, Syahrul S, Wijayanta AT, Muliyanto A, Winata LA. Effect of evaporator numbers on water production of a free convection air water harvester. Case Studies in Thermal Engineering. 2021: 72: 101253. [2]. Mirmanto M, Wirawan M, Najib A. Effect of capillary tube length on the mass of water production. International Journal of Advances in Engineering and Management. 2022: 4: 210-216. [3]. Mirmanto M, Nurchayati N, Afriani I. Performance of air-water harvester machine for cooling drinking water. IOSR Journal of Mechanical and Civil Engineering. 2022: 19(2): 1-6.
[4]. Atmoko YWT. Karakteristik Mesin Penghasil Air Dari Udara Menggunakan Mesin Siklus Kompresi Uap Dengan Tambahan Kipas Pemadat Udara Berkecepatan Putaran Kipas 300 RPM Dan 350 RPM. Yogyakarta, Sanata Dharma University. 2018.
[5]. Dirgantara RP. Pengaruh Posisi Evaporator Terhadap Jumlah Air Embun Yang Di Hasilkan Dengan Menggunakan Sistem Kompresi Uap, Mataram : Universitas Mataram. 2021.

Abstract: Microbial Fuel Cell (MFC) technology is becoming popular day by day. It is considered as a future scope of renewable source of energy. The main focus is to generate energy on large scale to fulfil the energy requirement along with treatment of waste water. Lot of modifications in components parts used in MFC are happening to make this technology economical and simple in operation. Configuration of MFC is also one of the parameter in development of MFC. This review paper highlights on different configurations used for MFC set up..

Key word: Microbial Fuel Cell; Renewable; Energy; Configuration; Economical

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[5]. Du Z, Li H, Gu T. A state of the art review on microbial fuel cells: a promising technology for wastewater treatment and bioenergy.
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Abstract: Background:Concrete is a commonly used construction building material because it is characterized by its compressive strength, which ultimately gives durability and stability to the structure. Resources essential in the production of concrete cement, sand, aggregate, and water. Today's fast urbanization has increased the demand for construction materials, causing a shortage of these resources. Day-to-day infrastructure is leading to the demand for fresh water and river sand. To create replacements for these materials, research and development are still being done. On the other hand, sea sand and seawater are abundant in coastal areas. Recent research has shown that these substances can be used in place of fresh water and river sand. Furthermore, construction can be done without harming the.......

Key Word: Sea water sea sand concrete, Compressive strength, Carbonation, Scanning Electron Microscopy

[1]. A. Younis, U. Ebead, P. Suraneni, and A. Nanni, "Fresh and hardened properties of seawater-mixed concrete," Constr. Build. Mater., vol. 190, pp. 276–286, 2018, doi: 10.1016/j.conbuildmat.2018.09.126.
[2]. Erniati, M. W. Tjaronge, R. Djamaluddin, and V. Sampebulu, "Compressive strength and slump flow of self compacting concrete uses fresh water and sea water," ARPN J. Eng. Appl. Sci., vol. 10, no. 6, pp. 2373–2377, 2015.
[3]. F. Adeyemi and G. Modupeola, "The Effect of Sea Water on Compressive Strength of Concrete," vol. 3, no. July 2014, pp. 23–31, 2010.
[4]. J. Xiao, C. Qiang, A. Nanni, and K. Zhang, "Use of sea-sand and seawater in concrete construction : Current status and future opportunities," Constr. Build. Mater., vol. 155, pp. 1101–1111, 2017, doi: 10.1016/j.conbuildmat.2017.08.130.
[5]. Q. Zhang, J. Xiao, P. Zhang, and K. Zhang, "Mechanical behaviour of seawater sea-sand recycled coarse aggregate concrete columns under axial compressive loading," Constr. Build. Mater., vol. 229, p. 117050, 2019, doi: 10.1016/j.conbuildmat.2019.117050..

Abstract: Due to rapid industrialization and urbanization, the demand for usage of electricity is increasing at an alarming rate. At the same time, fly ash and pond ash is produced in thermal power plant in large quantity. Fly ash is used as an alternative material in construction industries while pond ash is disposed-off on huge land areas. This study focuses on assessing the quality of self-compacting concrete(SCC) incorporating pond ash by using ultrasonic pulse velocity method which is non-destructive testing method of concrete.Fine aggregate is replaced by pond ash in percentages of 10, 15,..........

Key Word: Self compacting concrete; Pond ash; UPV; Compressive strength; Fine aggregate

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Abstract: Using nonlinear Finite-Element-Method (FEM), a three-dimensional model is built for post-tensioned(PT) concrete girders that are strengthened in shear using externally bonded (EB) carbon Fibre-Reinforced-Polymer (CFRP) reinforcement. The finite element (FE) model for a control/reference T-section girder was validated using experimental work that is found in the literature. A parametric study was executed to investigate the effectiveness of EB CFRP strengthening, different configuration scheme of CFRP laminates and configuration of orientation angle on the predicted shear force capacity of the aged/damaged girders. The outputs of the study exhibited that shear strengthening with EB CFRP could be an effective tool for enhancement of the shear capacity of (PT) concrete girders.

Key Word: Finite element; Pre-stressed concrete; Post-tensioned concrete; Girders; Shear; Strengthening; Fibre reinforced polymer.

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